An unusual variant of squamous cell carcinoma (inverted verrucous carcinoma) arising in a pilonidal sinus

Abstract

A case of squamous cell carcinoma arising in a chronic pilonidal sinus in a 59‐year‐old man is described. Twenty‐seven instances of malignant change in a pilonidal sinus have been previously documented, none of which showed the pattern seen in this case. The possibility of malignant change in longstanding pilonidal sinus is emphasized.